package cn.itcast.bos.web.action.base;



import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Join;
import javax.persistence.criteria.JoinType;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;

import org.apache.commons.lang3.StringUtils;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Namespace;
import org.apache.struts2.convention.annotation.ParentPackage;
import org.apache.struts2.convention.annotation.Result;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.stereotype.Controller;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

import cn.itcast.bos.domain.base.Courier;
import cn.itcast.bos.service.base.CourierService;

@ParentPackage("json-default")
@Namespace("/")
@Controller
@Scope("prototype")
public class CourierAction extends ActionSupport implements ModelDriven<Courier>{

	// 模型驱动
	private Courier courier = new Courier();
	@Override
	public Courier getModel() {
		return courier;
	}
	//注入service
	@Autowired
	private CourierService courierService;
	
	// 添加快递员方法
	@Action(value = "courier_save", results = { @Result(name="success",location="./pages/base/courier.html",type="redirect")})
	public String save() {
		courierService.save(courier);
		return SUCCESS;
	}
	//属性驱动接受客户端分页参数
	private int page;
	private int rows;
	public void setPage(int page) {
		this.page = page;
	}
	public void setRows(int rows) {
		this.rows = rows;
	}
	//分页查询方法
	@Action(value="courier_pageQuery",results={@Result(name="success",type="json")})
	public String pageQuery(){
		// 封装Pageable对象
		Pageable pageable = new PageRequest(page - 1, rows);
		
		//根据查询条件构造spectificcation条件查询对象（类似Hibernate的QBC查询）
		Specification<Courier> specification = new Specification<Courier>() {

			@Override
			/**
			 * 构造条件查询方法，如果方法返回null,代表无条件查询
			 * Root 参数，获取条件表达式 name=?,age=?
			 * CriteriaQuery参数，可以用于简单条件查询
			 * CriteriaBuilder 用于构造复杂条件查询
			 */
			public Predicate toPredicate(Root<Courier> root,
					CriteriaQuery<?> query, CriteriaBuilder cb) {
				//当前查询	Root跟对象Courier
				List<Predicate> list = new ArrayList<Predicate>();
				// 简单单表查询
				if(StringUtils.isNotBlank(courier.getCourierNum())){
					Predicate p1 = cb.equal(root.get("courierNum").as(String.class),
							courier.getCourierNum());
					list.add(p1);
				}
				if (StringUtils.isNotBlank(courier.getCompany())){
					Predicate p2 = cb.like(root.get("company").as(String.class),
							"%"+courier.getCompany()+"%");
					list.add(p2);
				}
				if(StringUtils.isNotBlank(courier.getType())){
					Predicate p3 = cb.equal(root.get("type").as(String.class), 
							courier.getType());
					list.add(p3);
				}
				// 多表查询
				Join<Courier, Object> standardjoin = root.join("standard",JoinType.INNER);
				if(courier.getStandard()!=null && StringUtils.isNotBlank(courier.getStandard().getName())){
					Predicate p4 = cb.like(standardjoin.get("name").as(String.class),
							"%"+courier.getStandard().getName()+"%");
					list.add(p4);
				}
				return cb.and(list.toArray(new Predicate[0]));
			}
		};
		
		
		//调用业务层，返回page
		Page<Courier> pageData = courierService.findPageData(specification,pageable);
		
		//将返回的page对象转换成datagrid需要格式
		Map<String, Object> result = new HashMap<String, Object>();
		result.put("total", pageData.getTotalElements());
		result.put("rows", pageData.getContent());
		
		//将结果对象，压入值栈顶部
		ActionContext.getContext().getValueStack().push(result);
		
		return SUCCESS;
	}
	//属性驱动
	private String ids;
	public void setIds(String ids) {
		this.ids = ids;
	}
	
	//作废快递员
	@Action(value="courier_delBatch",results={@Result(name="success",
			location="./pages/base/courier.html",type="redirect")})
	public String delBatch(){
		//按，分隔ids
		String[] idArray = ids.split(",");
		//调用业务层，批量作废
		courierService.delBatch(idArray);
		return SUCCESS;
	}

}
